As with other stages in this game, Green Grove consists of two standard Acts followed by a third Act containing only the boss fight. In Acts 1 and 2, Sonic must free captured Flickies from inside badniks, depositing five of the birds into a Goal Ring to progress between sections of the level (usually three per Act).
Green Grove is Sonic 3D's typical Green-Hill-esque opening stage. Checkered brown soil, loop-the-loops, palm trees, and idyllic waterfalls come as standard tropical fare. There are also Spin Dash-able walls and winding underground passageways for the more adventurous hedgehog—and giant cannons, too, for some reason. In the Saturn version, anthropomorphic moles can be seen burrowing in the soil. Geographically, the zone is located on Flickies' Island.
- Main Article: Eggmobile (spike ball dropper)
Doctor Robotnik, understandably displeased that his cobalt nemesis has discovered his dastardly machinations on Flickies' Island, takes measures to forcibly remove Sonic by dropping heavy objects on him. The Doc's modified Egg-O-Matic hauls a spiked iron ball around in gripping pincers, periodically throwing it at the hedgehog. The ball seems possesses a tracking mechanism, so keep moving while it's bouncing around the floor. Robotnik can be defeated by spin-jumping his pod whens he descends to pick the weapon back up.